//
// Copyright (c) 2017-2020 the rbfx project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "../Precompiled.h"

#include "../IO/Log.h"
#include "../RenderPipeline/InstancingBuffer.h"

#include "../DebugNew.h"

namespace Urho3D
{

InstancingBuffer::InstancingBuffer(Context* context)
    : Object(context)
{
}

void InstancingBuffer::SetSettings(const InstancingBufferSettings& settings)
{
    if (settings_ != settings)
    {
        settings_ = settings;
        Initialize();
    }
}

void InstancingBuffer::Begin()
{
    if (vertexBuffer_)
        vertexBuffer_->Discard();
}

void InstancingBuffer::End()
{
    if (vertexBuffer_)
        vertexBuffer_->Commit();
}

void InstancingBuffer::Initialize()
{
    vertexBuffer_ = nullptr;

    if (settings_.enableInstancing_)
    {
        ea::vector<VertexElement> vertexElements;
        for (unsigned i = 0; i < settings_.numInstancingTexCoords_; ++i)
        {
            const unsigned index = settings_.firstInstancingTexCoord_ + i;
            vertexElements.push_back(VertexElement(TYPE_VECTOR4, SEM_TEXCOORD, index, settings_.stepRate_));
        }

        vertexBuffer_ = MakeShared<DynamicVertexBuffer>(context_);
        vertexBuffer_->SetDebugName("InstancingBuffer");
        vertexBuffer_->Initialize(128, vertexElements);
    }
}

}
